Tesla 3 Owner's Manual page 182

If Model 3 Has No Power
If Model 3 has no 12V power, perform the
following steps to open the hood or jump start
the auxiliary 12V battery.
Jump Starting the 12V Battery
Caution: Model 3 cannot be used to jump
start another vehicle. Doing so can result
in damage.
Note: If jump starting Model 3 using another
vehicle, refer to that vehicle manufacturer's
instructions. The following instructions assume
an external 12V power supply (such as a
portable jump starter) is used.
Caution: Avoid short circuits when jump
starting Model 3. Connecting cables to
the wrong terminals, touching leads
together, etc. can result in damage to
Model 3.
1. Open the hood (see
Power on page 18).
2. Remove the maintenance panel by pulling
it upwards to release the trim clips that
hold it in place.
Roadside Assistance
Opening with No
Instructions for Transporters
3. Remove the cabin intake trim panel by
pulling it upwards to release the trim clips
that hold it in place.
4. Connect the 12V power supply's red
positive (+) cable to the red positive (+)
terminal on the 12V battery.
Caution: To avoid damaging Model 3,
do not allow the positive cable to
contact other metal components,
such as the battery tie-down bracket.
5. Connect the 12V power supply's black
negative (-) cable to the black negative (-)
terminal on the 12V battery.
6. Turn on the external power supply (refer
to the manufacturer's instructions). Touch
the touchscreen to wake it up.
Note: It may take several minutes to
receive enough power to wake up the
touchscreen.
7. When external 12V power is no longer
required, disconnect both cables from the
terminals on the 12V battery, beginning
with the black negative (-) cable.
8. Replace the cabin intake trim panel by
placing it back in its original location and
pressing down until it is secure.
9. Replace the maintenance panel by placing
it back in its original location and pressing
down until it is secure.
10. Close the hood.
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